Apparatus for regulating combustion in furnaces.



PATENTED FEB. 19

H. L. oHBRTY. APPARATUS PoR REGULATING GOMBUSTION IN-PURNAGES.

. APPLIOATION lFILED FEB. 1.. 19.04.

No. 844,504. PATENTED FEB. 19, 1907. H. L. DOHER'IY.

APPARATUS FOR REGULATING COMBUSTION IN FURNAGES.

APPLICATION FILED FEB. l. 1904.

5 SHEET/S-SHEET 2.

` PATENTED PEB. 19, 1907. l H. L. DOHERTY. APPARATUS POR REGULATI'NGGOMBUSTION IN FURNACBS.

*APPLICATION FILED FEB. 1. 1904.

5 SHEETS-SHEET 3.

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" PATENTED FEB.- 19, 1907.

. E. L. DOHERTY.. APPARATUS FOR RBGULATING GOMBUSTION 1N mRNA-GES.A

APPLICATION FILED PEB. 1. 1904.

5 BIIEET-BEEBT 5.

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- Seventeenth street, Denver,

, bonaceous material.

v3,0 trouble in cleaning out.

l so as to be present.

4o Afuel is ,not -burned e oXid by the air so admitted. The carbondioxid, which is introduced and which may bev is used in place ofWaterv4 or steam and may suitable source and UNITED STATES l'PATENTOEEIOE."

HENRY L. DOHERTY, OE MADISON, wIscoNsIN, AssIoNOE, BYMEsN'E AssIeN'MENTs To oOMBUsTION UTILITIES COMPANY, or NEW YORK, N. Y., A

CORPORATION OF NEW YORK.

' .APPARATUS Fon nEGui-.AT'INGYCOMBusTloN IN IFURNAGES.v

` .Specificationof Letters Patent.`

^ Patented Feb.'19, 1907.

Application filed February 1,1904. Serial No. 191.404;

To a/ZZ 4whom, ,it -may concern: Beit known that I, HENRY L. DOHERTY, ofMadison, Wisconsin, (post-oflicc address care of The Improved EquipmentCompany, 405 Oolorado,) .have '\ir`lven'fed' certain new and usefulImproves ments in Apparatus tion in Furnaces, of specification. i

ulating combustion in furnaces, and is particularly desirable Sanduseful connection with'gasfpro ducers and other furnaces where#A in thetemperature vtends to become excess- 15 ively high "ried out y passingair or air `with' steam` ov throu h the body .of fuel, which may besoftor other suitable car-` Water-boshes and drip.

plates 'are used for the purppse of facilitating "the production ofsteam, 2 5 carbon, parting with its oxygen, and thus procoal, ard coal,coke,

w ch acts upon the duci'ng la mixture of carbon monoXid and hy drogen.If the steam is not used, the bed of fucl will become gradually hotterand hotter, causing Also the steam or water-vapor serves to keep downthe etemper-- ature. j y j In carrying outthe objects of the inventioncarbon dioxid,l is introduced to the fuel, 't'h the oxygen that sup-vports combustion, means being provided for introducing'the carbon dioXidin quantities -commensurate with the supply of air, and b oth being so`limited that lthe carbon of the completely to carbon ,di-

pure or impure,

be obtained from any is preferably preheated. ,Usually it can beobtained from the products of combustion already heated, and byreturning Vit'under the vgrate Y that muchheat is [saved as comparedwith the heatingv of coalgas un 4tothe ignition temperature. The c'ar-0`n dioxid,'ifobtained 'from the previouslytermed #products forRegulating Combusv which the following is a.

This invention relates to apparatus for regcaking and clinkering fandgivingl of the produc injector shown in the aforesaid figures.

ingRanother form of the invention.

of combustion and valrea y' 'is'provded with preheated, willaccomplish'the reduction of temperature in the ,furnace with thegreatest economy and without any such' Waste of en-` ergy as would occurif water were employed in place .of the carbon dioXid and first raisedto boiling and then, introduced as steam. There is also a furthereconomy effectuated through the introduction of the hot hue-gases andproducts of combustion under the grate, because they invariably containa considerable amount Of'unburne'd oxygen and some unburned combustiblegals, which, being already heated, 'saves the amount of energy thatwould be. required to heat the equiva lent quantity of air with its fourvolumes of inert nitrogen for each-volume of-Whichwould have to beraised to the ternperature of the furnace.

of, oxygen, 'all' with a gas-producer a suitable injector or fan c ispreferab y used for introducing the air and the carbon dioxid.Preferablyv the form of 'injector or fan which is to be described hereinis used. l

vIn the accompanying drawings there is shown for the purpose of clearlyindicating the principles of the invention a twin gasproducer, and inthese drawings, Figure l'ris a sectional Fig. Z-is a vertical sectionthereof, thesame showing to the left the producer which is shown 1nsection in Fig. 1 and to the right showing the setting and re ener'ativeparts r which yis're atively back of or to the rear of the producershown in Fig. 2. Fig. 3 is a section on theline 3 3 of Fig. 1. l Fig'..4is a front elevation of the iuegas 1 51s a side elevation of saidinjector. Figg is a plan. Fig. 7 isa vertical section through 8o fr ontelevation of a gas-producer.

the injector on the line 7 7, Fig. 5. Fig. 8 is# View thereof; and Figs.11, 12, and 13 are -l views of similar character to 1, 2, and 3,show

eferring now to these drawings, and more'particularly to Figs. y1, 2,and 3, which 'willbebrieiy described,the gas-producer a a charging-chuteb, through supplied.

force-d through the channels m 1t into: the'` ducts f and through theports f under they grate and to the -fuel. Where atmospheric air isdrawn in, ofcourse .the nitro en gas is 5 heated up by contact with thehot rie-gases,

no evident, that pure oxygen maybe drawn, in

or lthat carbon' dioxid 'from any suitablesource other than'the produceritself maybe It is immaterial lto thejprinciple 'of the in'- r 5 ventionWhat form of injector, -fan, orother apparatus is used for introducingthe air and the carbon dioxid, though 'it is of courseadivantageous thatthe quantity of carbon diox'id introduced be controlled and madecommensurate with the quantity of oxygen .or air admitted. The eater'thequanitty of carbon dioxid intro uced thelower will be the temperature.`The introduction of too great anv amount would Wholly retard z5combustion, while vthe introduction of an insuicient amountl wouldmaintain the tem-y perature at too high a point.l Consequently in thepractice of the invention a greater or Y less amount isAadmitted,'according to the V 3o temperature desired, it beingpreferable lto admit. a little more rather than less than the amountrequired to properly controlv the temperature.I As this is known tovaryunder different 4conditions and different qualidioxid for' abouttwelve volumes ofB air will `vvork- -advantageously.` By 'properly con;Itrolling the dampers k2 and o 'the regulation maybe accomplished to a--nic'ety--'` When -there is a certain pressure of theinjector-air,-

and-theiiuefgases inthe lues, g .carry a certain proportion of oxygenandcarbon dioxid,

the mixture of' flue-gases. and air delivered' underv the grate-bars'can be varied by open'- .ing or closing] the damper kt Thisi could alsbe accomplished by opening .or closing lthe damper o ,provided thepressure under the grate was less than atmospheric pressure, which Would.allow 'the-'outside air to pass through the openinlg's controlledbyfsaid Y damper. vI-Iigher e ciency could also be maintained byusingsomeofthe heat of the waste flue.- gases to' heat the injector air.Where the combustion is to gbeg, completed, instead of utilizing thegas' elsewhere, a furvther supply of oxygen or air is admitted after theises leave the fuel-supply, and the gases InFigsQQ and 1Q a modification of them-Q Zvention'is/s own in which insteadof an'ar fan p is'mountedon a .vertical shaft pf, which the urnace.

I'ally in usej ties of. fuel, no exact rule can be given. In practice itis found that one volume of carbon are, urned Substantially completelyto car` g, that is supported from the lupper part of the tile-section jtThe upper end 'of the shaft pt may be provided with a, steamturbine-Wheel 1", which 'may be driven by steam from a nozzle 1 inwell-known manner, sup- 7o plied 'from a boiler, which maybe heated byThe fan turns in a fan-casings, which is provided with a steam-outlet s.The fan-shaft turns,'preferably, in metaline bushings, suc as t t',Which do not require lubrication, and- Which'also can withstand 'theintense heat to which they are subjected. A damper u regulates theamount of air which is drawn in by the fan p, 4Whichfan also draws `inthe Wastezi'iue-gases through the opening` v. In Figs. 11, 12, andl-an'otherformof gasbench is illustrated, in which the improved,

I process can'be carried' out.l This bench is quite similar in generaldesign to that of the one shown in Figs. .1 to 3, inclusive, thedifference being,` however, that in thebench shown in Figs.y 11 to 13the Waste ases, after heatin the retorts, may be brou t down tol the fue-bed in the furnace with t e least ossible` loss of heat. In a furnaceof this c aracter or construction the Waste gases, leavingthe retorts at2,300 to 2,5009 and brought down without much loss of temperature,wouldl probably melt the grate-bar si'gener- This calls for a change inthe construction of the grateLbars and likewise a change in the locatlonandconstructi'on of the injecting apparatus. The general partsl oftheapparatus having beendescribed Willioo -the chan ed parts Willbe givenyadditional refeenceetters. Additional o'r primary air l other than thatlfurnished by thel injectorl nozzlew', inserted4 into aiiue w', tobeheref' in after referred to, is admitted through an ,fopen'ingcontrolled by a damper co2, this additional air flowing throu h suitablepassages '.1`b3,1vvhich by means of auct lc4-connect with 1 1 'ov [thespecial vertical injector flue .I. The

type of recuperator Hues v which are shown are believed to be moree-licient` than the ordinary type of luesnow used;4 Thedamper-controlled opening-y (shown to the .115

left of Fig.' 1 1) vfor the secondary alr connects,

bymeans of eculiarly-arranged zigzag passages y, Wit the 4combustion-chamber' in which the retorts are arranged, the .ducts lead-`ing from said passages for the secondary airl I'zo to said chamber beingindicated by-y2. These passages and ducts y y2 are lclearly shown-to theright. of Fig-.11, the transverse'portions of the passages y being shownto the -ht lof Fig. 12. The Hue-gases pass out ,o the 125 4chimney yaftenirst passing throughl a sys-gtem' of zigzag passages g4, which'are-connected at their 4upper ends with the. combus-v tion-chamber..The upper portions of these vpassages yf* forthe line-gases vandproducts 'of' 13o combustion are connected by means of said specialinjector-flue with short branch fiues which are located under theproducer, or rather under the grates, and which communicate with flue w,which contains a bushing, tile, or fire-brick provided With a flaringpassagers?, similar to the corresponding passage in the injectorapparatus shown in Figs.

1, 2, and 3. Thefsaid branch flue w is formed in'an elbow and extends oropens unerneatli the grate, Said ,injector-flute serves for .the purposeof'bringing the Waste or flue gas directly down with the leastpossibleloss vof heat. The injector w, being located as shown,^serves alone forthe purpose of taking care of the entire Waste gases thatl are required.It will be understood. that there is a special injector-flue n: at eachside of the producer, branching 4off from the horizontal fluev w', intowhich thejinjector is'inserted. As ordinary grate-bars would in allprobability be-melted by the intense yheat of the Waste ases, a specialformof rate is desirable. v he' grate z shown is of fIr the purpose ofwithstanding the additional heat., The grate is composed of tworetortshaped parts z', ofire-clay, 'which are open-at both ends, theinner ends being connected with the branch ilue fw', While the up er..walls ofthe said parts zareprovidedwd n ...ai

number of longitudina ly-extending holes or slots z2. 'Ihese holes"allow -the Waste gases and air to pass directly up into the bed of fueland the ashes to drop down. In this form of the apparatus the Wastegases and the necessary air to` support combustion are brought to thefuel-bed at the highest possible temperature in order to economize inthe fuel which is necessary to operate the bench.

e-clay for 1 ers or in modified form, WhatI claim as new and of myinvention is- 1. In an apparatus for regulatingcombuscombiistion-cliainber, flues for primary air and for secondary airand. flues for Waste gases,of passages or channels connectin theWaste-gas' lu'es with the primary airues, said channels being providedwith a dampercontrolled opening for air and. anadjustable injectorprojecting into said channels or passages.

fied, the combination of a gas-producer, a gas-` turn-flues for productsof combustion leading from the combustion-chamber to the stackair-fines, primary air-fines leading under- .neath thegrate, an injectorfor conducting air land a portion ofthe products of combusineans inaddition to the injectorior regulating the bustion. Y In ltestimonywhereof I have signed this specification in the presence of ytwosubscribingwitnesses.

j HENRY L. DOHERTY. Witnesses: j l

` R. B. SULLIVAN,

EUGENE Y. SAYER.

tion infurnaces, the combination with a gasproducing furnace comprisingthe producer,v

furnace having a regener'ator, a discharge- `and arranged in proximityto the secondaryl mixture of'airand productsof com-y ues leading to thecombustion-chamber, re-

tionfrom the return-flues to the grate, and

. 55 2. In an apparatus of the character speci-

